Most junior engineers start at the application server. Liu starts at the browser.
You live with your parents until you get married. You consult your mother before buying a phone. You don't "visit" your grandmother; you live with her. System Design Interview Fundamentals Rylan Liu Pdf
While Rylan Liu's book is highly regarded for its focus on fundamental application, candidates often supplement it with other industry standards: Alex Xu's System Design Interview - An Insider's Guide Most junior engineers start at the application server
Mastering the System Design Interview: A Guide to Rylan Liu’s Fundamentals System Design Interview Fundamentals Rylan Liu Pdf